Improvement in india-rubber syringes



d UNITED STATES PATENT OFFICE.

F. M. SHEPARD, OF NEW YORK, N. Y., ASSIGNOR T0 HIMSIELF AND W. A. SHEPARD.

IMPROVEMENT IN INDIA-RUBBER SYRINGES.

Specification forming part of Lctters Patent No. 43,158, dated June 14, 1864.

To all 'whom 'it may concern.

Be it known that I, F. M. SHEPARD, of New York, in the county and State of New York, have invented certain new and useful Improvernents in Syringes 5 and Iherebydeclare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, which represents, in sectional elevation, a syringe constructed in accordance with my invention.

My invention relates to syringes composed ot' an elastic bulb, with which are connected, by means of a suction and a forcing valve, two tiexible tubes, so that by alternately com pressing the bulb the liquid to beinjected is drawn from the reservoir by one tube and ejected or forced through the other. These syringes were heretofore made of two materials-that is to say, the bulb and tubes were made ot' soft vulcanized rubber, while the trimmings,77 such as the valves,valveboxes,injection tube or' nozzle, and suction-pieee, were made of metal. Great objections to these syringes were urged on account of theliquid remaining in the syringe in contact with the metal, corrod ing it'or forming with it, particularly it' an acid or alkaline solutio'h be used, (as is otten thc case for medical purposes,) poisonous salts. Minor objections are suggested, such as the weight and cost. Now, the object of this invention is to remedy this evil by the construction of a syringe of the character described in which metal is entirely orin great measure dispensed with, producing alighter and cheaper article unattaekable by acids or alkalies such as would be used for purposes of injection; and my invention consists in forma, convex on one side and plane surfaced on v the other, and provided on the convex side with a stem, b, whereby it is guided in its upand down play. The valve chamber or box is composed of two parts screwed together. The interior of the one is concave in confortnity with the convexity ofthe valve, forml ing the valve-seat to intercept communication r between either pipe and the bulb, and the interior of the other is indented, so as to allow the liquid to pass through the opening or indentation whenl the valve is oftl its seat. A valve-chamber with its valve is attached to either end ot' the bulb by simply disteuding the elastic rim over the shoulder d, so as to clasp over and under it. The two valves are arranged on the bulb in opposite directions for inverse action, so that when one, by the compression of the bulb, is closed, the other will, actuated by the same cause, be opened. In this,'and in some other particulars, the syringe operates substantially in the same manner as those heretofore in use. Having now described my invention, and c the manner in which the same is or may be l performed, I claim as a new article ot' manufacture- A Alrelastic india-rubber bulb syringe in which thetrimmingsf. e., the valvecases and other non-elastic partsare made of vulcanite or hard rubber, in eontradistinction to metal,

ing the trimmings of bulb syringessuch as of which they were heretofore made.

valves, valve boxes, and other parts heretoi fore made of 1n canite.

In the dra-wing, A is the bulb, made, of vulcanized india-rubber, in theform of an egg, having at the small `ends the india-rubber tubes B B, connected therewith by means of valve chambers C. These are made ot' vuletal-of hard rubber or vul- In testimony whereof I have signed my ing witnesses.

F. M. SHEPARD.

Vitnesses: I GEO. SIMMONS, Jr.,

lEo. W. Fuos'r.

name to this speeitication before two subsrrib.- 

